MICROSCOPIC DRAWING AND ENGRAVING. 
described by him as a bright round nebula, surrounded by a halo or 
glory, and attended by a much smaller companion. Sir John 
58 
however, when he examined the same object with his great fifty- 
three foot telescope, having six feet aperture, it assumed the 
appearance shown in fig. 14. 
19. Another very remarkable example of the change of appear- 
Fig. 12. 
ance produced in one of these wonderful objects, is presented in 
the case of a nebula first observed by Sir Wm. Herschel, and 
